keyboards turned american

I reformateed and everything went fine until I just try to log into my email and type xxxx"gmail.com

On an american keyboard the @ is shift and 2, not shift and ' as on a British keyboard. I must have entered some wrong info in xp installation, I can live with this, but its kinda annoying, so anyway to change it back without reformatting and putting in correct installtion?

This happened to me a while ago.

Start>Control Panel>Regional and Language Options.

Then change everything to UK.